Hexane on top of water?
Yes. If you put water and hexane in a beaker or a container together, the hexane will be on top of the water. One way to see this is to dye the water. They do not mix because water is polar and the hexane cannot dissolve in it. It is on top because, guess why? It is less dense than water. That is why anything floats on water... it is less dense! Hope that answers your question!
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Technically, a needle is heavier than water, so it doesn't really float in the usual sense of the word. It is suspended by surface tension between the water molecules on t…he surface, which makes the surface of the water act as an elastic membrane. This membrane is strong enough to support objects of low weight, especially if that weight is spread out over a large area. (As a counter-example, if you dropped that same needle, point first, into the water, it would immediately break through the surface and sink to the bottom, because steel is heavier than water.) Different substances have different degrees of surface tension. Water exhibits enough surface tension to "float" a needle (if it is slowly, carefully laid down, on its side on the surface). Hexane does not have enough surface tension to support a needle, regardless of how it is placed on the surface.
If hexane is mixed with water, they cannot be mixed completelytogether. They are both immiscible, so if mixing is attempted, onlya two-layer solution will remain.
No hexane is immiscible in water.
Improved Answer When it comes to miscability, just remember this simple rule "Like dissolves like". In other words, the closer (chemically) two things are to each other, th…e more likely they are to be freely soluble in each other. Water and ethanol an 'OH' group in common. Ethanol and hexane have CH2's and CH3's in common. However water and hexanes don't have anything in common. Therefore, they are too different from each other and are not miscible... Old (not so good) Answer Hexane is not soluble in water because Hexane is a Nonpolar solvent while water is Polar solvent. Like dissolves like. Hexane also does not Conduct electricity.
No, Hexane does not disolve in water. Water is a polar molecule while hexane is a non polar molecule. Like dissolves like.
Hexane is less dense than water and is not miscible-- therefore, it floats.
No hexane is insoluble in water. "Like dissolves like" meaning the more alike (chemically) two things are the more likely they will be soluble in each other. Hexane and water …are just chemically too different. Hexane has a very low solubility in water, just a few mg/l. For most purposes it can be considered insoluble. However in one very important aspect it must not be considered insoluble. The vapour pressure of hexane above water containing just a few mg/l is as great as above pure hexane and can lead to explosive atmospheres.
Float, because it is less dense than water.
Hexane and gasoline both are insoluble in water.
phase separation. the two solvents must have similar polarities and b.p.'s - no crystals would form...and if for some reason they did, they would be impure
Water is a polar molecule (is a dipole, has a positive end and a negative end), hexane is a non-polar molecule. Like dissolves like. Water will dissolve other polar molecules,… like HCl and NH 3 . Hexane will dissolve non-polar molecules like benzene or toluene.
Ethanol is soluble in water because the -OH group of ethanol (CH3CH2OH) can form hydrogen bonds with water. Hydrogen bonding occurs when a very electronegative molecule like O…, N, F are bonded to molecules like hydrogen. For this example, I'll talk about groups that have -NH, -SH, -OH. These electronegative atoms pull the electron cloud away from hydrogen and becomes slightly more negative and hydrogen slightly more positive. Now, this means other identical molecules that have the same groups are attracted to each other: a -OH group attracted to another -OH group because of their mini "magnetic poles." Since there is hydrogen bonding, other water molecules bind to it and undergo solvolysis, which is a definition of dissolving one ethanol molecule in a large crowd of water molecules. Ethanol is effectively dissolved because water molecules are binding to it through hydrogen bonding. Hexane, however, is composed of 8 hydrocarbon molecules. It does not exhibit hydrogen bonding. Even though ethanol has two carbon molecules, it does not make a big difference of solubility in hexane unless its carbon chain increases past eight. Therefore, ethanol will more likely bind to its own OH group and will not be dissolved.
Hexane is a non-polar molecule and water is a polar molecule. Thus, they do not mix since polar molecules mix with polar ones and non-polar molecules mix with non-polar ones.
Hexane separated and don't mixed with water because water is polar and hexane is non polar so it cannot dissolve in it.